Don't pay expensive plumber to dig ditches. 

I would keep the deposit unless I am able to rebook the dates and then I would only make her pay the difference for any unbooked nights. 

Because it is an investment property, you would pay all fees, including appraisal.

Japanese mind set :)WE just make our money pay our tax's and try to stack cash so we can provide it others and rent the money for a fee :)

Now, you need to figure out how to find deals and pay for them.

The benefit is it is revolving so you can take it out and pay it back multiple times.

HCV in the area pays $2,200.

Second, if you want a nice house in a nice part of town, you will have to pay for it, so will likely need to raise your purchase price.Third, if you want to go off-market, just know you are trading a lot of time for the possibility of maybe finding a deal.  

That means paying all cash isn’t an option unless you plan to bring another $600k to the table. . 

Any positive cash flow should go towards paying off debt.